More than 12 million watched the legend's last episode – a million more than the show's usual audience.
The soap claimed a 58% share of television watchers, with a peak of 12.6 million tuning in.
An ITV1 spokeswoman said: "This was a historic moment in the Street's history and we are delighted that so many viewers tuned in to bid Mike Baldwin farewell."
Johnny Briggs, who played Mike, had been on the soap for 30 years, making him one of its longest serving actors.
More: Soaps
Soap Scoop
Emmerdale Rachel, Laurel row - videoWatch a video preview of Monday's Emmerdale episode.
Soaps Interviews
Emmerdale star talks John Barton exitWe chat to James Thornton about his dramatic Emmerdale departure.
Soap Ratings
Helen Flanagan's Corrie exit draws 9.3mThe young actress brings in more than 9.2m for both episodes in the double bill.
Reality Bites
Does Simon Cowell have new SuBo?: VideoWatch a clip of Jonathan Antoine, who is tipped for success on BGT.
